US8018206B2 - Excitation device for an electric machine - Google Patents
Excitation device for an electric machine Download PDFInfo
- Publication number
- US8018206B2 US8018206B2 US11/992,846 US99284606A US8018206B2 US 8018206 B2 US8018206 B2 US 8018206B2 US 99284606 A US99284606 A US 99284606A US 8018206 B2 US8018206 B2 US 8018206B2
- Authority
- US
- United States
- Prior art keywords
- excitation device
- superconducting
- voltage
- excitation
- energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
- 230000005284 excitation Effects 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000001939 inductive effect Effects 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims description 24
- 230000002457 bidirectional effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 230000006870 function Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/18—Rotary transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/006—Supplying energising or de-energising current; Flux pumps
- H01F6/008—Electric circuit arrangements for energising superconductive electromagnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/38—Structural association of synchronous generators with exciting machines
Definitions
- the electric machine is a synchronous machine, which preferably, but not exclusively, uses a superconducting inductance as the field winding.
- the excitation losses can advantageously be reduced to a minimum by implementing the exciter winding as a high-temperature superconducting (HTS) winding.
- HTS high-temperature superconducting
- any input of heat via mechanical contacts should be avoided as far as possible.
- Mechanical contacts such as sliprings or the like, are involved as a result of the maintenance required and moreover are susceptible to wear.
- the excitation power, the monitoring and regulation information is advantageously transmitted in contactless fashion, i.e. inductively, to the rotor.
- Known excitation devices for a superconducting winding typically include a contactless energy transmission path, a contactless control or regulating signal transmission path to a stationary control and regulating unit, and an actuator for impressing a voltage and a freewheeling circuit.
- the transformer in particular functions inductively.
- EP 1 247 324 B1 proposes a unidirectional inductive energy transmission, a “rotating transformer” including two pot-type cores with ring windings and axial flux guidance being provided as inductive operating means.
- the pot-type cores can move toward one another about the common axis.
- an improved excitation device for a winding which can be used in electric machines.
- Described below is a synchronous machine with a superconducting field winding; however, it is also suitable for exciting non-superconducting windings.
- the inductive transformer in this case advantageously includes pot-type cores and a suitable voltage actuator on the rotor.
- a superconducting inductance can be fed directly.
- a bipolar voltage can be impressed on the superconducting inductance. If this voltage has a constant absolute value, the superconducting inductance can be excited or de-excited linearly in corresponding fashion.
- the rotating transformer does not necessarily need to be operated in star-connected fashion as a result of a reduced capacity utilization. Transmission at mid-frequency, under certain circumstances if possible at resonant frequency, is recommended for a good power density of the inductive transformer, with the result that the components are small.
- the single FIGURE is a circuit diagram of a device for the bidirectional excitation and de-excitation especially of a superconducting coil.
- the circuit in detail includes a system terminal 1 as the voltage source, a downstream converter 2 including a rectifier with a connected inverter 3 and associated electronics. Furthermore, an inductive transformer 5 is provided whose equivalent circuit diagram as a contactless transformer is illustrated in the enlarged illustration A.
- an excitation circuit 6 with voltage input or setting for an inductance is connected to the transformer 5 .
- the inductance is formed from a coil made of superconducting material, in particular of high-temperature superconducting (HTS) material, which has a comparatively high critical temperature.
- HTS high-temperature superconducting
- the superconducting coil with the inductance value L SC is overall denoted by 10 .
- a freewheeling circuit 11 is connected in parallel with the superconducting coil 10 .
- the freewheeling circuit 11 is arranged in the direct vicinity of the superconducting winding 11 and, in accordance with specifications, has a low resistance value.
- An external actuator 7 for providing a bipolar voltage on the superconducting winding 10 in the event of a unipolar field current is essential for the dynamic operation of the excitation field. If, during the demagnetization, a power failure occurs on the primary side of an excitation device, the HTS winding 10 needs to be connected to the freewheeling circuit 11 since the excitation power then does not need to be dissipated to the primary side. Otherwise, the electrical power on the stator of the machine would need to be converted into heat.
- a three-phase steady-state system terminal makes available a DC voltage on the intermediate circuit capacitance C 1 by a standard rectifier.
- Predetermining a bidirectional power flow requires either a self-commutated voltage-impressing rectifier or a simple line-commutated diode bridge with a braking chopper for converting the energy which can be fed back from the superconducting inductance.
- the power flow from the system terminal to the superconducting inductance is illustrated (from left to right).
- the inverter 3 and the transmission path are voltage-impressing converters.
- the inverter (for example with the IGBTs S1 x , D1 x ) converts the DC voltage into a square-wave voltage with a mid-frequency f S .
- the rectifier (S2 x in this case MOSFETs with intrinsic freewheeling diodes) functions on a DC voltage capacitor C 2 .
- the use of MOSFETs on the secondary side is preferably suitable in the case of a comparatively low voltage U 2 .
- a sinusoidal current in the AC intermediate circuit results, with the inductive voltage drops across the stray inductances L ⁇ x being compensated for.
- the resonant capacitance can also only be applied on one side.
- the selection of the capacitance C 2 which is suitable in terms of the correct attenuation is explained in the dissertation cited at the outset.
- the respective rectifier is always passive, and the corresponding power switches (IGBTs or diodes) are correspondingly turned off by the sequence controller.
- the diodes conduct the current and are naturally commutated.
- the inverter switches the IGBTs on with zero current and hard off. However, then only the low delta-wave magnetization current needs to be commutated to the diodes.
- the superordinate steady-state sequence controller controls the excitation or de-excitation or the freewheeling of the field current and the rotating voltage actuator in order to control U LSC .
- S 5 -S 7 with the diodes Dr 1 and the body diode Dfr of S 7 function as the voltage actuator. If S 5 and S 6 are in the switched-on state and S 7 is in the switched-off state, the HTS winding is excited by the voltage ⁇ U C2 . If S 5 is switched off, the diode Dfr takes on the free-wheeling current. Its forward voltage is reduced by the MOSFET S 7 being switched on in the third quadrant of its control characteristic and therefore substantially taking on the freewheeling current. If S 6 is switched off, the voltage ⁇ U C2 is present at L SC . The HTS winding 10 is therefore de-excited.
- the arrangement described is particularly suitable for feeding a large rotating HTS inductance, whose magnetization current is controlled in steady-state fashion by low regulation/control dynamics.
- the sequence controller has knowledge on the direction of the power flow, with the result that no synchronization of the inverter and the rectifier is required as in the related art mentioned at the outset.
- the respective rectifier is always passive, and the corresponding power switches (IGBTs or diodes) are correspondingly turned off by the sequence controller.
- Optical, inductive or capacitive systems can be used for the contactless data transmission of the field current measured values and the control information of the secondary converters.
- a particular advantage of the described circuit is the fact that the excitation and de-excitation can take place in controlled fashion in the circuits described. A separate energy source is therefore not required for de-excitation purposes.
- the system also includes permanent or removable storage, such as magnetic and optical discs, RAM, ROM, etc. on which the process and data structures of the present invention can be stored and distributed.
- the processes can also be distributed via, for example, down-loading over a network such as the Internet.
- the system can output the results to a display device, printer, readily accessible memory or another computer on a network.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Superconductive Dynamoelectric Machines (AREA)
- Control Of Eletrric Generators (AREA)
- Control Of Ac Motors In General (AREA)
- Rectifiers (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
across C2, with the IR drops across the transformer windings and on the power semiconductors, is not much less than the voltage UC1 calculated using the transformation ratio on the secondary side. The losses occurring are also used for attenuating the system in the event of sudden load variations on the capacitance C2, however.
Claims (9)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005047551 | 2005-09-30 | ||
DE102005047551.5 | 2005-09-30 | ||
DE102005047551A DE102005047551A1 (en) | 2005-09-30 | 2005-09-30 | Exciter device for an electrical machine |
PCT/EP2006/066214 WO2007039410A1 (en) | 2005-09-30 | 2006-09-11 | Excitation device for an electric machine |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090153106A1 US20090153106A1 (en) | 2009-06-18 |
US8018206B2 true US8018206B2 (en) | 2011-09-13 |
Family
ID=37402623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/992,846 Expired - Fee Related US8018206B2 (en) | 2005-09-30 | 2006-09-11 | Excitation device for an electric machine |
Country Status (7)
Country | Link |
---|---|
US (1) | US8018206B2 (en) |
EP (1) | EP1929616B1 (en) |
KR (2) | KR101526164B1 (en) |
CN (1) | CN101278470B (en) |
DE (1) | DE102005047551A1 (en) |
ES (1) | ES2523582T3 (en) |
WO (1) | WO2007039410A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100066340A1 (en) * | 2006-12-20 | 2010-03-18 | Analogic Corporation | Non-Contact Rotary Power Transfer System |
US8860383B2 (en) | 2010-01-13 | 2014-10-14 | Brusa Elektronik Ag | Control device and method for controlling a separately excited rotor winding of a synchronous machine |
US8963476B2 (en) | 2011-03-11 | 2015-02-24 | Brusa Elektronik Ag | Synchronous machine with switching element in the excitation circuit |
US20170063251A1 (en) * | 2015-08-26 | 2017-03-02 | Futurewei Technologies, Inc. | AC/DC Converters |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005047551A1 (en) * | 2005-09-30 | 2007-04-12 | Siemens Ag | Exciter device for an electrical machine |
WO2010105764A1 (en) * | 2009-03-19 | 2010-09-23 | Sew-Eurodrive Gmbh & Co. Kg | Rotary transmitter and separately excited synchronous machine |
DE102009040394A1 (en) * | 2009-09-07 | 2011-03-17 | Siemens Aktiengesellschaft | Excitation device for an electrical machine with superconducting load |
US20110141771A1 (en) * | 2010-12-07 | 2011-06-16 | Karl Kyrberg | Electric power system including power converter and rotary transformer and method of assembling same |
KR101405878B1 (en) * | 2011-01-26 | 2014-06-12 | 가부시키가이샤 무라타 세이사쿠쇼 | Power transmission system |
JP5575731B2 (en) * | 2011-11-17 | 2014-08-20 | 株式会社日立情報通信エンジニアリング | Power supply device and control method of power supply device |
WO2013085393A2 (en) * | 2011-12-07 | 2013-06-13 | National Oilwell Varco Norway As | Apparatus and method for transferring electrical power to a rotating shaft |
DE102012112864A1 (en) * | 2012-12-21 | 2014-06-26 | Robert Bosch Gmbh | Battery device system for, e.g. hand tool has charging device that transmits charging power to battery element via contact area having preset power densityin charging mode |
DE102014117524A1 (en) | 2014-11-28 | 2016-06-02 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Electric induction machine |
CN107979275A (en) * | 2016-10-21 | 2018-05-01 | 南京理工大学 | A kind of new three-phase single-level active power factor correction device |
CN107979277A (en) * | 2016-10-21 | 2018-05-01 | 南京理工大学 | A kind of power factor correcting based on novel transformer and inductor |
CN110620512B (en) * | 2018-06-20 | 2020-09-15 | 台达电子工业股份有限公司 | Resonant converter and control method |
CN111585462A (en) * | 2020-05-25 | 2020-08-25 | 中国科学院合肥物质科学研究院 | Magnetic resonance superconducting magnet lifting field device |
Citations (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1488978A1 (en) | 1966-08-16 | 1969-04-03 | Licentia Gmbh | Electric rotating device |
DE1438628A1 (en) | 1962-10-09 | 1969-04-30 | Siemens Ag | Arrangement for the excitation of a synchronous machine without slip rings |
DE1563783A1 (en) | 1966-12-09 | 1970-04-09 | Siemens Ag | Arrangement for fine regulation of the voltage and for de-energizing load-dependent excited synchronous machines |
US3784888A (en) * | 1972-06-26 | 1974-01-08 | Allis Chalmers | Control for commutatorless motor |
US3931553A (en) * | 1972-08-07 | 1976-01-06 | Allis-Chalmers Corporation | Electronic commutation system having motor stator windings in push-pull |
US3956679A (en) * | 1973-12-22 | 1976-05-11 | C.A.V. Limited | Brushless A.C. synchronous motors |
US3991351A (en) * | 1973-12-22 | 1976-11-09 | C.A.V. Limited | Brushless A.C. synchronous motors |
US4093869A (en) * | 1976-04-13 | 1978-06-06 | Westinghouse Electric Corp. | Quadrature axis field brushless exciter |
US4549130A (en) * | 1983-07-12 | 1985-10-22 | International Business Machines Corporation | Low leakage transformers for efficient line isolation in VHF switching power supplies |
US4949362A (en) * | 1989-03-09 | 1990-08-14 | General Electric Company | System for detecting and limiting electrical ground faults within electrical devices |
DE4133001A1 (en) | 1990-10-05 | 1992-04-09 | Toshiba Kawasaki Kk | Superconductive current generator with cold rotor - has refrigeration device for cooling medium fed through rotor winding incorporated in rotor |
US6288551B1 (en) * | 1995-08-19 | 2001-09-11 | Robert Bosch Gmbh | System for controlling the resistance of a load connected to a transformer |
US6301128B1 (en) * | 2000-02-09 | 2001-10-09 | Delta Electronics, Inc. | Contactless electrical energy transmission system |
US6362588B1 (en) | 2000-02-09 | 2002-03-26 | Reliance Electric Technologies, Llc | Excitation system for rotating synchronous machines |
US6396247B1 (en) * | 2000-11-15 | 2002-05-28 | Eaton Corporation | Exciter system with protection for manual regulator failure and an electric generator incorporating same |
US6462432B1 (en) * | 1997-08-18 | 2002-10-08 | Alstom Anlagen- Und Automatisierungstechnik Gmbh | Method and device for inductive transmission of electric power to a plurality of mobile consumers |
EP1247324B1 (en) | 2000-01-11 | 2004-03-24 | American Superconductor Corporation | Exciter and electronic regulator for superconducting rotating machinery |
DE10237779A1 (en) | 2002-08-17 | 2004-03-25 | Daimlerchrysler Ag | Converter for motor vehicle with at least one electrical energy supply and load, produces two variable input voltages with phase shift so current peaks on constant input voltage side are phase shifted |
US6934167B2 (en) * | 2003-05-01 | 2005-08-23 | Delta Electronics, Inc. | Contactless electrical energy transmission system having a primary side current feedback control and soft-switched secondary side rectifier |
US20050218741A1 (en) * | 2004-03-18 | 2005-10-06 | Wnorowski Edward J Jr | Generators, transformers and stators containing high-strength, laminated, carbon-fiber windings |
US20060113968A1 (en) * | 2002-08-17 | 2006-06-01 | Altana Pharma Ag | Novel benzonaphthyridines |
US20060267523A1 (en) * | 2003-01-20 | 2006-11-30 | Eurocopter Deutschland Gmbh | Device and method for transmitting and proving the energy of capacitive actuators |
US20070120539A1 (en) * | 2005-11-29 | 2007-05-31 | Bray James W | Cryogenic exciter |
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US20100066299A1 (en) * | 2006-11-08 | 2010-03-18 | Mitsuru Izumi | Superconductive rotating electric machine drive control system and superconductive rotating electric machine drive control method |
US20100071889A1 (en) * | 2008-09-19 | 2010-03-25 | Brad Radl | Closed loop control of hydrogen cooling of an electric power generator |
US7687928B2 (en) * | 2006-06-14 | 2010-03-30 | Smiths Aerospace, Llc | Dual-structured aircraft engine starter/generator |
US20100134074A1 (en) * | 2005-02-24 | 2010-06-03 | Allan David Crane | Exciter assemblies |
US20100147605A1 (en) * | 2007-10-26 | 2010-06-17 | Frederick William Klatt | Brushless Multiphase Self-Commutation Control (or BMSCC) and Related Inventions |
US20100171381A1 (en) * | 2007-01-16 | 2010-07-08 | Gangqin Ling | Self-contained intelligent cascaded synchronous electric motor-generator tandems of cumulative compound excitation |
US20100219786A1 (en) * | 2007-09-11 | 2010-09-02 | Abb Schweiz Ag | Method and apparatus for determining a field current in brushless electrical machines |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1581675A (en) * | 2004-05-14 | 2005-02-16 | 国电自动化研究院 | Generator controlled follow-current type de-excitation circuit |
-
2005
- 2005-09-30 DE DE102005047551A patent/DE102005047551A1/en not_active Withdrawn
-
2006
- 2006-09-11 CN CN2006800363348A patent/CN101278470B/en not_active Expired - Fee Related
- 2006-09-11 KR KR1020087010302A patent/KR101526164B1/en active IP Right Grant
- 2006-09-11 US US11/992,846 patent/US8018206B2/en not_active Expired - Fee Related
- 2006-09-11 KR KR1020147006387A patent/KR20140040286A/en not_active Application Discontinuation
- 2006-09-11 EP EP06793396.0A patent/EP1929616B1/en not_active Not-in-force
- 2006-09-11 ES ES06793396.0T patent/ES2523582T3/en active Active
- 2006-09-11 WO PCT/EP2006/066214 patent/WO2007039410A1/en active Application Filing
Patent Citations (33)
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DE1438628A1 (en) | 1962-10-09 | 1969-04-30 | Siemens Ag | Arrangement for the excitation of a synchronous machine without slip rings |
DE1488978A1 (en) | 1966-08-16 | 1969-04-03 | Licentia Gmbh | Electric rotating device |
DE1563783A1 (en) | 1966-12-09 | 1970-04-09 | Siemens Ag | Arrangement for fine regulation of the voltage and for de-energizing load-dependent excited synchronous machines |
US3784888A (en) * | 1972-06-26 | 1974-01-08 | Allis Chalmers | Control for commutatorless motor |
US3931553A (en) * | 1972-08-07 | 1976-01-06 | Allis-Chalmers Corporation | Electronic commutation system having motor stator windings in push-pull |
US3991351A (en) * | 1973-12-22 | 1976-11-09 | C.A.V. Limited | Brushless A.C. synchronous motors |
US3956679A (en) * | 1973-12-22 | 1976-05-11 | C.A.V. Limited | Brushless A.C. synchronous motors |
US4093869A (en) * | 1976-04-13 | 1978-06-06 | Westinghouse Electric Corp. | Quadrature axis field brushless exciter |
US4549130A (en) * | 1983-07-12 | 1985-10-22 | International Business Machines Corporation | Low leakage transformers for efficient line isolation in VHF switching power supplies |
US4949362A (en) * | 1989-03-09 | 1990-08-14 | General Electric Company | System for detecting and limiting electrical ground faults within electrical devices |
DE4133001A1 (en) | 1990-10-05 | 1992-04-09 | Toshiba Kawasaki Kk | Superconductive current generator with cold rotor - has refrigeration device for cooling medium fed through rotor winding incorporated in rotor |
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DE10237779A1 (en) | 2002-08-17 | 2004-03-25 | Daimlerchrysler Ag | Converter for motor vehicle with at least one electrical energy supply and load, produces two variable input voltages with phase shift so current peaks on constant input voltage side are phase shifted |
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US20100071889A1 (en) * | 2008-09-19 | 2010-03-25 | Brad Radl | Closed loop control of hydrogen cooling of an electric power generator |
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Title |
---|
Albert Esser; "Berührungslose, Kombinierte Energie-und Infomationsübertragung für Bewegliche Systeme"; Von der Fakultät für Elektrotechnik-Fachbereich 6-der Rheinisch-Westfälischen Technishen Hochschule Aachen zur Erlangung des akademischen Grades eines Doktor-Ingenieurs genehmigte Dissertation; Feb. 1992; pp. 1-127. |
Communication issued by the European Patent Office on Feb. 28, 2011 in the related European patent application. |
German Office Action for Application No. 10 2005 047 551.5-32; dated Dec. 21, 2006. |
International Search Report for Application No. PCT/EP2006/066214; mailed Dec. 12, 2006. |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100066340A1 (en) * | 2006-12-20 | 2010-03-18 | Analogic Corporation | Non-Contact Rotary Power Transfer System |
US8581437B2 (en) * | 2006-12-20 | 2013-11-12 | Analogic Corporation | Non-contact rotary power transfer system |
US8860383B2 (en) | 2010-01-13 | 2014-10-14 | Brusa Elektronik Ag | Control device and method for controlling a separately excited rotor winding of a synchronous machine |
US8963476B2 (en) | 2011-03-11 | 2015-02-24 | Brusa Elektronik Ag | Synchronous machine with switching element in the excitation circuit |
US20170063251A1 (en) * | 2015-08-26 | 2017-03-02 | Futurewei Technologies, Inc. | AC/DC Converters |
US9973099B2 (en) * | 2015-08-26 | 2018-05-15 | Futurewei Technologies, Inc. | AC/DC converters with wider voltage regulation range |
US10135350B2 (en) | 2015-08-26 | 2018-11-20 | Futurewei Technologies, Inc. | AC/DC converters with wider voltage regulation range |
Also Published As
Publication number | Publication date |
---|---|
WO2007039410A1 (en) | 2007-04-12 |
DE102005047551A1 (en) | 2007-04-12 |
US20090153106A1 (en) | 2009-06-18 |
CN101278470A (en) | 2008-10-01 |
EP1929616B1 (en) | 2014-10-29 |
KR20140040286A (en) | 2014-04-02 |
KR101526164B1 (en) | 2015-06-18 |
KR20080068829A (en) | 2008-07-24 |
ES2523582T3 (en) | 2014-11-27 |
EP1929616A1 (en) | 2008-06-11 |
CN101278470B (en) | 2010-09-15 |
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